See the post Bob is referring to, but no, it's not a valid nit.
If you don't feel like reading, it was argued that a digital sig is not a valid ZKP because the pubkey is revealed. In fact the Zero knowledgeness property is trivially demonstrable (for Schnorr) if you establish the right context.

The pubkey should be considered part of the setup/fixed in advanced. Then zero knowledgeness can be proved by the indistinguishability of real and fake transcripts. Here a Schnorr sig is exactly a zero knowledge proof of knowledge.

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